JSF ui:repeat tag dymanic id creation issue

These are dynamically generated attributes from back end .. so we need to capture these param inside the controller

We have custom scope which is integrated with spring which is view. These form data is getting lost since we are using modal window for navigation and thus it looses data for each of the navigation flow . this is exactly opposite behavior compared to definition of view scope.

But what is happening when i am trying to generate id dynamically to map attributes inside a hashmap in my controller

it is coming as null .. i went through couple of sites and found that jsf does not support dynamic creation of id